I sure don't see too many of those any more. I believe they were first introduced in the late 60's to early 70's.
I just took a look at my parts break-down and believe it or not, many of the parts from the E-47's are interchangeable (motor, pump, tank, ram etc.)
This pump came in (2) versions, a single valve and a dual valve (these parts are not available from the factory).
If it helps I could either fax or email this manual to you (6 pages). If emailing, I will have to scan each page first.
You will also notice that the parts numbers in the manual start with the numbers "20". Just disregard the "20" and that will give you current Meyer parts numbers (if available).
Hope this helps.
Brian